/*
 * Copyright (c) 2010-2025 Haifeng Li. All rights reserved.
 *
 * Smile is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Smile is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Smile. If not, see <https://www.gnu.org/licenses/>.
 */
package smile.base.mlp;

/**
 * The builder of layers.
 *
 * @author Haifeng Li
 */
public abstract class LayerBuilder {

    /** The number of neurons. */
    protected final int neurons;
    /** The dropout rate. */
    protected final double dropout;

    /**
     * Constructor.
     * @param neurons the number of neurons.
     * @param dropout the dropout rate.
     */
    public LayerBuilder(int neurons, double dropout) {
        this.neurons = neurons;
        this.dropout = dropout;
    }

    /**
     * Returns the number of neurons.
     * @return the number of neurons.
     */
    public int neurons() {
        return neurons;
    }

    /**
     * Builds a layer.
     *
     * @param p the number of input variables (not including bias value).
     * @return a layer.
     */
    public abstract Layer build(int p);
}